Black smoke rises from Gaza City Sunday morning, as Israeli tanks gather on the Gaza border.
Over in the southern Gaza town of Rafah, Palestinians wake up to a sea of destruction caused by Israeli air strikes.
A 72-hour truce between Israel and Hamas Islamist militants expired on Friday.
Now renewed fighting is jeopardizing international efforts to negotiate a lasting ceasefire.
Prime Minister Benjamin Netanyahu says that Israel will not return to talks until Hamas stops its cross-border rocket attacks.
(SOUNDBITE) (Hebrew) PRIME MINISTER BENJAMIN NETANYAHU SAYING:
"At no stage did we declare that Israel's military offensive was over. The operation will continue until its objective - the restoration of quiet over a protracted period - is achieved. I said at the beginning and throughout the operation - it will take time, and stamina is required."
Since Friday, Hamas has fired more than 100 rockets into Israel and Israel has killed 14 Palestinians in air strikes.
At least 1,891 Palestinians -- mostly civilians -- have been killed since the conflict began on July 8.
Israel has lost 64 soldiers and three civilians.

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